from itsdangerous import TimedJSONWebSignatureSerializer as Serializer, BadDatafrom django.conf import settingsdef generate_openid_signature(openid):    """对openid进行加密 """    # 1.创建加密实例对象    serializer = Serializer(secret_key=settings.SECRET_KEY, expires_in=600)    # 2. 包装要加密的数据 {}    data = {'openid': openid}    # 3. 调用dumps方法进行加密  bytes    openid_bytes = serializer.dumps(data)  # 序列化(模型转换成字典)--> 输出    # 4. 加bytes转换成str类型    return openid_bytes.decode()def check_openid(openid_sign):    """对openid进行解密"""    # 1.创建加密实例对象    serializer = Serializer(secret_key=settings.SECRET_KEY, expires_in=600)    try:        # 对openid进行解密        data = serializer.loads(openid_sign)  # 反序列化(字典转换成模型)  ----> 输入        # 返回openi        return data.get('openid')    except BadData:        return None